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          <th colspan="3" align="center">Chapter 6. 
                The DB_LOCK Handle
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            <h2 class="title"><a id="lock"></a>Chapter 6. 
                The DB_LOCK Handle
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      <pre class="programlisting">#include &lt;db.h&gt;

typedef struct __db_lock_u DB_LOCK;  </pre>
      <p>
            The locking interfaces for the Berkeley DB database environment
            are methods of the <a class="link" href="env.html" title="Chapter 5.  The DB_ENV Handle">DB_ENV</a>
            handle. The <code class="classname">DB_LOCK</code> object is 
            the handle for a single lock, and has no methods of its own.
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              <h2 class="title" style="clear: both"><a id="locklist"></a>Locking Subsystem and Related Methods</h2>
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                <th>Locking Subsystem and Related Methods</th>
                <th>Description</th>
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                <td>
                  <a class="xref" href="lockdetect.html" title="DB_ENV-&gt;lock_detect()">DB_ENV-&gt;lock_detect()</a>
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                <td>Perform deadlock detection</td>
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                  <a class="xref" href="lockget.html" title="DB_ENV-&gt;lock_get()">DB_ENV-&gt;lock_get()</a>
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                <td>Acquire a lock</td>
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                <td>
                  <a class="xref" href="lockid.html" title="DB_ENV-&gt;lock_id()">DB_ENV-&gt;lock_id()</a>
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                <td>Acquire a locker ID</td>
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                  <a class="xref" href="lockid_free.html" title="DB_ENV-&gt;lock_id_free()">DB_ENV-&gt;lock_id_free()</a>
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                <td>Release a locker ID</td>
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                <td>
                  <a class="xref" href="lockput.html" title="DB_ENV-&gt;lock_put()">DB_ENV-&gt;lock_put()</a>
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                <td>Release a lock</td>
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                <td>
                  <a class="xref" href="lockstat.html" title="DB_ENV-&gt;lock_stat()">DB_ENV-&gt;lock_stat()</a>
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                <td>Return lock subsystem statistics</td>
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                  <a class="xref" href="lockstat_print.html" title="DB_ENV-&gt;lock_stat_print()">DB_ENV-&gt;lock_stat_print()</a>
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                <td>Print lock subsystem statistics</td>
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                <td>
                  <a class="xref" href="lockvec.html" title="DB_ENV-&gt;lock_vec()">DB_ENV-&gt;lock_vec()</a>
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                <td>Acquire/release locks</td>
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                <td>
                  <a class="xref" href="envcdsgroup_begin.html" title="DB_ENV-&gt;cdsgroup_begin()">DB_ENV-&gt;cdsgroup_begin()</a>
                </td>
                <td>Get a locker ID in Berkeley DB Concurrent Data Store</td>
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                  <span class="bold">
                    <strong>Locking Subsystem Configuration</strong>
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                <td><a class="xref" href="envset_timeout.html" title="DB_ENV-&gt;set_timeout()">DB_ENV-&gt;set_timeout()</a>, <a class="xref" href="envget_timeout.html" title="DB_ENV-&gt;get_timeout()">DB_ENV-&gt;get_timeout()</a></td>
                <td>Set/get lock and transaction timeout</td>
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                <td><a class="xref" href="envset_lk_conflicts.html" title="DB_ENV-&gt;set_lk_conflicts()">DB_ENV-&gt;set_lk_conflicts()</a>, <a class="xref" href="envget_lk_conflicts.html" title="DB_ENV-&gt;get_lk_conflicts()">DB_ENV-&gt;get_lk_conflicts()</a></td>
                <td>Set/get lock conflicts matrix</td>
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                <td><a class="xref" href="envset_lk_detect.html" title="DB_ENV-&gt;set_lk_detect()">DB_ENV-&gt;set_lk_detect()</a>, <a class="xref" href="envget_lk_detect.html" title="DB_ENV-&gt;get_lk_detect()">DB_ENV-&gt;get_lk_detect()</a></td>
                <td>Set/get automatic deadlock detection</td>
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                <td><a class="xref" href="envset_lk_max_lockers.html" title="DB_ENV-&gt;set_lk_max_lockers()">DB_ENV-&gt;set_lk_max_lockers()</a>, <a class="xref" href="envget_lk_max_lockers.html" title="DB_ENV-&gt;get_lk_max_lockers()">DB_ENV-&gt;get_lk_max_lockers()</a></td>
                <td>Set/get maximum number of lockers</td>
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                <td><a class="xref" href="envset_lk_max_locks.html" title="DB_ENV-&gt;set_lk_max_locks()">DB_ENV-&gt;set_lk_max_locks()</a>, <a class="xref" href="envget_lk_max_locks.html" title="DB_ENV-&gt;get_lk_max_locks()">DB_ENV-&gt;get_lk_max_locks()</a></td>
                <td>Set/get maximum number of locks</td>
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                <td><a class="xref" href="envset_lk_max_objects.html" title="DB_ENV-&gt;set_lk_max_objects()">DB_ENV-&gt;set_lk_max_objects()</a>, <a class="xref" href="envget_lk_max_objects.html" title="DB_ENV-&gt;get_lk_max_objects()">DB_ENV-&gt;get_lk_max_objects()</a></td>
                <td>Set/get maximum number of lock objects</td>
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                <td><a class="xref" href="envset_lk_partitions.html" title="DB_ENV-&gt;set_lk_partitions()">DB_ENV-&gt;set_lk_partitions()</a>, <a class="xref" href="envget_lk_partitions.html" title="DB_ENV-&gt;get_lk_partitions()">DB_ENV-&gt;get_lk_partitions()</a></td>
                <td>Set/get number of lock partitions</td>
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                <td><a class="xref" href="envset_lk_priority.html" title="DB_ENV-&gt;set_lk_priority()">DB_ENV-&gt;set_lk_priority()</a>, <a class="xref" href="envget_lk_priority.html" title="DB_ENV-&gt;get_lk_priority()">DB_ENV-&gt;get_lk_priority()</a></td>
                <td>Set/get a locker's deadlock priority</td>
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                <td><a class="xref" href="envset_lk_tablesize.html" title="DB_ENV-&gt;set_lk_tablesize()">DB_ENV-&gt;set_lk_tablesize()</a>, <a class="xref" href="envget_lk_tablesize.html" title="DB_ENV-&gt;get_lk_tablesize()">DB_ENV-&gt;get_lk_tablesize()</a></td>
                <td>Set/get size of the lock object hash table</td>
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